I put an iso in /dev/shm and rsync there into another dir and transfer rate is only 50M/s. I think something wrong with this picture, SSD hard drives are faster. Shouldn't ram to ram copying be nearly instant for a gig file??

I put an iso in /dev/shm and rsync there into another dir and transfer rate is only 50M/s. I think something wrong with this picture, SSD hard drives are faster. Shouldn't ram to ram copying be nearly instant for a gig file??

Where is that other directory mounted? My guess is that it is mounted on a hard drive.

There are a number of factors that would impact that speed, primarily, the CPU (type and speed), and the memory (type and number of channels). I have an i7 920 with triple channel DDR3.

Aside from Intel's high end desktop platform (socket 2011, quad channel memory), you pretty much only get dual channel memory nowadays, and since it's still DDR3, it's pretty much expected that it would have less memory bandwidth than my triple channel system, even though mine is over 4 years old now._________________Game! - Where the stick is mightier than the sword!